Updating root hint

This is generally implied rather than explicit, as modern DNS software does not actually require that the terminating dot be included when attempting to translate a domain name to an IP address.

The root domain contains all top-level domains of the Internet.

As of July 2015 domain is used for testing internationalized domain names.

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However, the root zone is controlled by the United States Department of Commerce who must approve all changes to the root zone file requested by ICANN.Such servers are synchronized with the official root zone file as published by ICANN, and do not constitute an alternate root.As the root name servers are an important part of the Internet, they have come under attack several times, although none of the attacks have ever been serious enough to severely affect the performance of the Internet.The DNS is a hierarchical naming system for computers, services, or any resource participating in the Internet. The root domain does not have a formal name and its label in the DNS hierarchy is an empty string.All fully qualified domain names (FQDNs) on the Internet can be regarded as ending with this empty string for the root domain, and therefore ending in a full stop character (the label delimiter), e.g., "".

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